Instructables

ZnSe lens cleaning


At work we have a ZING laser knockoff and SOMEbody "accidentally" walked off aaaand it caught on fire. Almost everything has been tried to clean it, even putting it in acetone in the ultrasonic cleaner, and the lens is still crap. Short of buying a £75 replacement lens what inexpensive methods could be used to return it to a near-original state?

lemonie3 years ago

What kind of "cack" is on the lens, i.e. what was burning?

L
The Ideanator (author)  lemonie3 years ago
Acrylic.

If it's not been carbonised, I'd have a go with dichloromethane/methanol paint-stripper and a cotton-bud.

L
The Ideanator (author)  lemonie3 years ago
What if it is carbonized or partially carbonized?

Nothing dissolves carbon, excepting carbon structures like balls & tubes, but they'll be a very small percentage of the dark stuff on there.

L
The Ideanator (author)  lemonie3 years ago
What if the carbon doesn't need to be dissolved, what would make the carbon want to let go of the ZnSe?

Oxygen + heat, perhaps? But I wouldn't fancy the chances of the lens surviving.
You might scrape it off, but I don't think zinc selenide is that hard.

L
The Ideanator (author)  lemonie3 years ago
What temperature would the conversion to CO2 happen in a non-plasma environment?

I don't know, and we don't know much about what is actually on the lens either.

L
lemonie lemonie3 years ago

Sorry, I forgot, carbon does dissolve in molten iron.

L
caitlinsdad3 years ago
Try wage garnishment, ...wait, ya'll are indentured apprentices?
The Ideanator (author)  caitlinsdad3 years ago
I dunno about indentured, but thats probably close. I might have to ask for a raise when I start going out in the British countryside and taking all the pretty young ladies out to dinner and such
Aye, nay mistake a kilt for a skirt.
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